Cook your veggie of choice until just soft. Cook onion and garlic until golden, and add veggie and heat through. In blender, puree tofu, soymilk, mustard, salt, nutmeg, pepper, and soy cheese, until smooth. Pour into large bowl and add the onion and veggie mixture. Combine well. Pour into pre-cooked pie shell, and bake at 400 degrees Fahrenheit for 35-40 minutes or until quiche is set. Allow to sit for 5 minutes before cutting.